Helmet bed



FIG. 1 is a front perspective view of the helmet bed of the present invention showing our new design, with the phantom lines depicting solely environmental structure and forming no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof. 

CLAIM The ornamental design for a helmet bed, as shown and described. 